Convert

Acre to Hectare

Exact answer: 1 acre = 0.40468564224 ha (exact defined factor)

Acre and Hectare describe the same quantity from the Area family but come from different systems of units. The factor is defined exactly. Areas appear in land registers, property listings, construction drawings and technical datasheets.

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What do you want to convert?

From1 acre

Result0.404686 ha

Factor1 acre = 0.40468564224 ha

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 acre = 0.404686 ha

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Area scales quadratically. A length factor is not automatically an area factor.

03Base unit: m²

1 acre = 4046.8564224 m². Then the value is converted through the base unit m² into Hectare.

Table

Acre to Hectare
Acre	Hectare
1	0.404686
2	0.809371
5	2.023428
10	4.046856
50	20.234282
100	40.468564

Formula

1 acre = 4046.8564224 m². Then the value is converted through the base unit m² into Hectare.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Hectare to Square metreha → m²Area Square metre to Hectarem² → haArea Acre to Square metreacre → m²Area Hectare to Acreha → acreArea

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Area. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Acre to Hectare?

1 acre = 0.40468564224 ha

Which formula does Acre to Hectare use?

1 acre = 4046.8564224 m². Then the value is converted through the base unit m² into Hectare.

What is the most common mistake?

Area scales quadratically. A length factor is not automatically an area factor.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.